package com.hmdp.utils;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {
    public static final long BEGIN_TIMESTAMP=1640995200L;
    public static final int COUNT_BITS=32;
    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    public long nextId(String keyPrefix) {
        //1,生成时间戳
       LocalDateTime now = LocalDateTime.now();
       long nowSecond=now.toEpochSecond(ZoneOffset.UTC);
       long timestamp=nowSecond-BEGIN_TIMESTAMP;

        //2,生成序列号
        //2.1,获取当前日期，精确到天
        String date = now.format(DateTimeFormatter.ofPattern("yyyy-MM-dd"));
        //2.2,自增长
        long count = stringRedisTemplate.opsForValue().increment("icr:"+keyPrefix+":"+date);


        //拼接并返回

        return timestamp<<COUNT_BITS|count;
    }


}
